Add the Ability to Pass Custom ignore_paths To Query Watcher

[Watercycle]

Problem

The "file" portion of the Query Watcher is unhelpful if you extend certain classes (e.g. MySqlConnection.php) since that adds a persistent layer to the stack trace.

Solution

One easy fix for this is to allow folks to specify any extra files they want excluded from the stack trace like so:

Watchers\QueryWatcher::class => [
    'enabled' => env('TELESCOPE_QUERY_WATCHER', true),
    'ignore_packages' => true,
    'ignore_paths' => ['MySqlConnection.php'],
    'slow' => 100,
]

(which fixes the above problem)

Where are the tests?

tests/Watchers/QueryWatcherTest.php doesn't try testing 'file' and there isn't a test file for FetchesStackTrace.php. I'm happy to take a go at adding some upon request if this solution seems acceptable. If not, let me know what solution you have in mind.